100122021191 has 4 divisors (see below), whose sum is σ = 100172615400. Its totient is φ = 100071426984.

The previous prime is 100122021151. The next prime is 100122021199. The reversal of 100122021191 is 191120221001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 191120221001 = 419 ⋅456134179.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100122021191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100122021199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25294136 + ... + 25298093.

It is an arithmetic number, because the mean of its divisors is an integer number (25043153850).

Almost surely, 2^100122021191 is an apocalyptic number.

100122021191 is a deficient number, since it is larger than the sum of its proper divisors (50594209).

100122021191 is an equidigital number, since it uses as much as digits as its factorization.

100122021191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50594208.

The product of its (nonzero) digits is 72, while the sum is 20.

Adding to 100122021191 its reverse (191120221001), we get a palindrome (291242242192).

The spelling of 100122021191 in words is "one hundred billion, one hundred twenty-two million, twenty-one thousand, one hundred ninety-one".